External battery



FIG. 1 is a front perspective view of an external battery showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines in the figures depict portions of the external battery that form no part of the claimed design. 

CLAIM The ornamental design for an external battery, as shown and described. 